smartsarath2003
Member level 4
Help with Mosfet Biasing
Hai,
I had a problem using mosfets. I am new to them and I tried use N-channel Enhancement mode mosfet(IRF540). I am attaching a rough circuit blocks as well. When i connected the gate to drain, i had approximately Vds=1-2V @5V Vin. I tried to connect the gate in voltage devider bias by using another 10k between ground and gate. But no effect. Rds(on) is 0.044R from data sheet.
Also The reason for me using the mosfet instead of Transistor is faster switching action. I red somewhere that all the terminals have some cepacitance between each other. if they have some cepacitance, won't this slow down switching :?: . Also does the current direction reverses in case of Depletion mosfets(S--> D) when compared to Enhancement mosfets (D-->S).Can anyone please clarify my doubts plz
Thanks
Hai,
I had a problem using mosfets. I am new to them and I tried use N-channel Enhancement mode mosfet(IRF540). I am attaching a rough circuit blocks as well. When i connected the gate to drain, i had approximately Vds=1-2V @5V Vin. I tried to connect the gate in voltage devider bias by using another 10k between ground and gate. But no effect. Rds(on) is 0.044R from data sheet.
Also The reason for me using the mosfet instead of Transistor is faster switching action. I red somewhere that all the terminals have some cepacitance between each other. if they have some cepacitance, won't this slow down switching :?: . Also does the current direction reverses in case of Depletion mosfets(S--> D) when compared to Enhancement mosfets (D-->S).Can anyone please clarify my doubts plz
Thanks